/* ─── Tokens CelestIA ─────────────────────────────── */
:root {
  --gold-line: rgba(217, 168, 90, 0.28);
  --gold-dim: rgba(217, 168, 90, 0.13);
  --cyan-dim: rgba(95, 212, 208, 0.16);
  --ink-dim: #b8b4ac;
  --ink-mute: #7a7870;
  --base: #02040c;
}

html,
body {
  height: 100%;
  overflow: hidden;
}
body {
  background: var(--base);
}

/* Variantes de couleur des particules */
.spark.gold {
  background: var(--gold-hi);
  box-shadow: 0 0 5px 1px var(--gold-hi);
}
.spark.cyan {
  background: var(--cyan);
  box-shadow: 0 0 5px 1px var(--cyan);
}

/* ─── Navbar — dark theme ─────────────────────────── */
header {
  background: linear-gradient(180deg, rgba(2, 4, 12, 0.96) 0%, transparent 100%);
  border-bottom: 1px solid var(--gold-dim);
}

/* ─── Background fixe ─────────────────────────────── */
.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image: url('../../assets/bg-celestia-WIP.png');
  background-size: cover;
  background-position: center;
}
.bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse at center,
      transparent 0%,
      transparent 28%,
      rgba(2, 4, 12, 0.18) 50%,
      rgba(2, 4, 12, 0.62) 75%,
      rgba(2, 4, 12, 0.88) 100%
    ),
    linear-gradient(
      180deg,
      rgba(2, 4, 12, 0.82) 0%,
      transparent 18%,
      transparent 78%,
      rgba(2, 4, 12, 0.82) 100%
    );
}

/* ─── Main ────────────────────────────────────────── */
main {
  position: relative;
  z-index: 5;
  height: calc(100vh - 64px);
  margin-top: 64px;
  pointer-events: none;
}

/* ─── Titre ───────────────────────────────────────── */
.page-title {
  position: absolute;
  top: clamp(20px, 4vh, 48px);
  left: 0;
  right: 0;
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(48px, 8vw, 88px);
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.01em;
  text-align: center;
  pointer-events: auto;
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) 0.3s forwards;
}
.page-title .ia {
  color: var(--gold);
  font-style: italic;
}

.page-sub {
  position: absolute;
  top: calc(clamp(20px, 4vh, 48px) + clamp(50px, 8.5vw, 92px) + 16px);
  left: 0;
  right: 0;
  font-family: var(--serif);
  font-size: clamp(22px, 3.5vw, 52px);
  font-weight: 300;
  font-style: italic;
  color: var(--ink-dim);
  letter-spacing: 0.02em;
  text-align: center;
  pointer-events: auto;
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) 0.5s forwards;
}

/* ─── Système orbital ─────────────────────────────── */
.orbital-system {
  position: fixed;
  top: 50vh;
  left: 50vw;
  width: 300px;
  height: 300px;
  opacity: 0;
  animation: fadeUpOrbit 1s cubic-bezier(0.2, 0.7, 0.2, 1) 0.7s forwards;
}
@keyframes fadeUpOrbit {
  from {
    opacity: 0;
    transform: translate(-50%, calc(-50% + 14px));
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

.deco-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(217, 168, 90, 0.1);
}
.deco-arc-gold {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border-top: 1.5px solid rgba(240, 201, 118, 0.55);
  border-right: 1.5px solid rgba(217, 168, 90, 0.18);
  border-bottom: 1.5px solid transparent;
  border-left: 1.5px solid transparent;
  filter: drop-shadow(0 0 8px rgba(217, 168, 90, 0.6));
  animation: spin 14s linear infinite;
}
.deco-arc-cyan {
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  border-bottom: 1px solid rgba(95, 212, 208, 0.32);
  border-left: 1px solid rgba(95, 212, 208, 0.12);
  border-top: 1px solid transparent;
  border-right: 1px solid transparent;
  animation: spin 20s linear infinite reverse;
}
.orbit-spin {
  position: absolute;
  inset: 0;
  animation: spin 28s linear infinite;
}
.satellite {
  position: absolute;
  width: 82px;
  height: 82px;
  border-radius: 50%;
  overflow: hidden;
  border: 1.5px solid var(--gold-line);
  box-shadow:
    0 0 16px rgba(217, 168, 90, 0.28),
    0 0 32px rgba(217, 168, 90, 0.1);
  background: rgba(2, 4, 12, 0.55);
  animation: spin 28s linear infinite reverse;
}
.satellite img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.satellite-charles {
  left: 18px;
  top: 57px;
}
.satellite-astra {
  left: 200px;
  top: 57px;
}
.satellite-caroline {
  left: 109px;
  top: 214px;
}

@media (min-width: 600px) {
  .cta {
    top: calc(50vh + 180px);
  }
  .orbital-system {
    width: 440px;
    height: 440px;
  }
  .system-center {
    width: 72px;
    height: 72px;
    left: 184px;
    top: 184px;
  }
  .satellite {
    width: 96px;
    height: 96px;
  }
  .satellite-charles {
    left: 38px;
    top: 95px;
  }
  .satellite-astra {
    left: 306px;
    top: 95px;
  }
  .satellite-caroline {
    left: 172px;
    top: 327px;
  }
}

/* ─── Bouton retour ───────────────────────────────── */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  padding: 13px 22px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.28em;
  font-weight: 600;
  text-transform: uppercase;
  background: transparent;
  position: absolute;
  top: calc(50vh + 110px);
  left: 50%;
  transform: translateX(-50%);
  overflow: hidden;
  transition: color 0.4s;
  cursor: pointer;
  pointer-events: auto;
  white-space: nowrap;
  opacity: 0;
  animation: fadeUpCta 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) 1.15s forwards;
}
@keyframes fadeUpCta {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}
.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gold);
  transform: translateX(-101%);
  transition: transform 0.4s cubic-bezier(0.7, 0, 0.3, 1);
}
.cta:hover {
  color: var(--base);
}
.cta:hover::before {
  transform: translateX(0);
}
.cta span,
.cta svg {
  position: relative;
  z-index: 1;
}
.cta svg {
  transition: transform 0.3s;
  flex-shrink: 0;
}
.cta:hover svg {
  transform: translateX(5px);
}
.cta:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

/* ─── Keyframes ───────────────────────────────────── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* ─── Reduced motion ──────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .page-title,
  .page-sub,
  .cta {
    opacity: 1 !important;
    animation: none !important;
  }
  .orbital-system {
    opacity: 1 !important;
    animation: none !important;
    transform: translate(-50%, -50%) !important;
  }
  .cta {
    transform: translateX(-50%) !important;
  }
  .deco-arc-gold,
  .deco-arc-cyan,
  .orbit-spin,
  .satellite {
    animation: none !important;
  }
  .spark {
    display: none !important;
  }
  .cta,
  .cta::before {
    transition: none !important;
  }
}

@media (max-height: 580px) {
  html,
  body {
    overflow: auto;
  }
}